| Happy House Sutton Ltd | Hospitality | 2022 |
| Happy IA Ltd | Extraterritorial | 2024 |
| Haptomass Ltd | Information & communication | 2022 |
| HAR Gobind Investments Limited | Wholesale & retail | 1991 |
| Haran by Haran Beauty Clinic Limited | Health & social care | 2017 |
| Harbour Rock Limited | Wholesale & retail | 2004 |
| Hardan Plant Hire Ltd | Administrative & support | 2022 |
| Harding Construction Limited | Construction | 2002 |
| Hari Consulting Limited | Information & communication | 2012 |
| Haritha Consultants Limited | Professional & scientific | 2023 |
| Harley Medical Solutions Limited | Health & social care | 2011 |
| Harmony Homes (Surrey) Ltd | Real estate | 2024 |
| Harmony HR Limited | Administrative & support | 2016 |
| Harnee Beauty UK Ltd | Other services | 2023 |
| Harold Whitehead & Partners Limited | Professional & scientific | 1995 |
| Harp & Harp Ltd | Professional & scientific | 2015 |
| Harp Healthcare Training & Support Ltd | Education | 2019 |
| Harrington Contracting Ltd | Construction | 2024 |
| Harringtons NO. 1 Limited | Hospitality | 2014 |
| Harrison Works Ltd | Administrative & support | 2025 |
| Harrow Management Limited | Real estate | 2002 |
| Harry & SON Building Contractors Ltd | Construction | 2022 |
| Harry Carpenter Tree Care Ltd | Administrative & support | 2020 |
| Hash Surveying Ltd | Construction | 2018 |
| HASH2112 Limited | Hospitality | 2026 |
| Haulex London Limited | Transport & logistics | 2023 |
| Hausey London Ltd | Health & social care | 2023 |
| Have FUN Solution Ltd | Administrative & support | 2022 |
| Haven Construction and Building Services Limited | Construction | 2005 |
| Havens Property UK Limited | Real estate | 2022 |
| Havnwright Ltd | Information & communication | 2025 |
| Hawi Holdings Ltd | Wholesale & retail | 2025 |
| Hayley Evans Ltd | Information & communication | 2023 |
| Hazim Ahmed Ltd | Transport & logistics | 2024 |
| Haztech Services Limited | Information & communication | 2018 |
| HB Bashi Ltd | Hospitality | 2019 |
| HB E-Commerce Limited | Wholesale & retail | 2025 |
| Hbcl UK Limited | Professional & scientific | 2020 |
| HC Fashion Ltd | Wholesale & retail | 2021 |
| Hcfr Property Ltd | Real estate | 2025 |
| Hchc Limited | Extraterritorial | 2019 |
| Hclear Financial Planning Limited | Financial services | 2014 |
| Hcth Ltd | Professional & scientific | 2024 |
| HD Clean Ltd | Administrative & support | 2025 |
| Hdrj Limited | Administrative & support | 2015 |
| Headley Build Limited | Construction | 2024 |
| Headstart Recruitment Ltd | Administrative & support | 2021 |
| Healing Angel Ltd | Health & social care | 2013 |
| Healing Paws Ltd | Professional & scientific | 2019 |
| Healthwatch Sutton | Health & social care | 2012 |
| Heartbeat Healthcare Services Limited | Administrative & support | 2024 |
| Heat-Now Limited | Manufacturing | 2015 |
| Heather Close Kingswood Limited | Households | 2020 |
| Heatherdene Apartments Limited | Real estate | 2017 |
| Heathfield Technology Limited | Professional & scientific | 1998 |
| Heaths Services (UK) Limited | Administrative & support | 2012 |
| Heavenly Feast Global Outreach | Other services | 2012 |
| Hedgegate Properties Limited | Real estate | 2004 |
| Heens Limited | Hospitality | 2014 |
| Heer Zahra Limited | Wholesale & retail | 2025 |
| Hegarty & Sons Property Ltd | Real estate | 2025 |
| Heian Bridge Writing Ltd | Information & communication | 2025 |
| Heidi's Cakes Limited | Wholesale & retail | 2021 |
| Helen Porter PA Services Limited | Administrative & support | 2018 |
| Helena's Cafe Ltd | Hospitality | 2023 |
| Helix Value Creation Partners Limited | Professional & scientific | 2013 |
| Hello Poppets International Ltd | Arts & recreation | 2025 |
| Hello Poppets International TOO Ltd | Arts & recreation | 2025 |
| Hello Poppets Ltd | Administrative & support | 2021 |
| Hello Poppets TOO Ltd | Arts & recreation | 2022 |
| Hello Poppets UK Tour Ltd | Arts & recreation | 2023 |
| Hello Poppets UK Tour TOO Ltd | Arts & recreation | 2025 |
| Helmys Design & Build Ltd | Construction | 2016 |
| Hema Engineering (PVT) Limited | Construction | 2018 |
| Hemster Limited | Real estate | 2019 |
| Hendfield Court Management Limited | Households | 1973 |
| Hendford Nursing Home Limited | Health & social care | 1986 |
| Hengde Fresh Ltd | Wholesale & retail | 2019 |
| Henley Park Limited | Wholesale & retail | 1992 |
| Hennell Fine Collections Limited | Wholesale & retail | 2009 |
| Hennell Limited | Professional & scientific | 1990 |
| Hennell of Bond Street Limited | Wholesale & retail | 1990 |
| Henry Decorations and Refurbishment Ltd | Construction | 2021 |
| Henslow and Co Limited | Professional & scientific | 2026 |
| Hepburn Architects Limited | Professional & scientific | 2024 |
| Herbwell Ltd | Wholesale & retail | 2026 |
| Here Comes the Hound Ltd | Professional & scientific | 2022 |
| Heritage Construction Services Limited | Construction | 2019 |
| Heritage Design & Build Ltd | Construction | 2010 |
| Heritage Properties (Onslow) Limited | Real estate | 2006 |
| Herlan UK Ltd | Wholesale & retail | 2024 |
| Hermon Haulage Ltd | Transport & logistics | 2013 |
| Heroics Limited | Information & communication | 2022 |
| Hesmith Healthcare Limited | Health & social care | 2016 |
| Hesterford Limited | Real estate | 1979 |
| Hexagon Taxi Fleet Ltd | Transport & logistics | 2017 |
| Heyne Services Ltd | Construction | 2014 |
| Heyward Court Residents Association Limited | Households | 1989 |
| HF Planning Limited | Financial services | 2021 |
| HFR Delivery Ltd | Transport & logistics | 2017 |